Showing a form in a Lightbox

Showing a form in the lightbox, with fading effect in option, should encourage
visitors to fill it...

We have seen how to
create a lightbox with fade in effect, we use the same JavaScript code
but we also simplify the CSS code because a form has a submit button
and a cancel button, so the close button may be removed.

The form is placed directly in the box on the page and does not need to be
loaded dynamically, although that option remains possible, and it is also
possible to create several boxes and leave a choice to the user. We can adapt
the code to do so.